How is the energy dissipated in the jump? How can jumps be used in engineering practice?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please use the table to answer the second question
**Questions for Discussion:**

1. **Summarize the energy loss across the jump that you created expressed as a percentage of the upstream energy. Do you consider this significant?**

2. **How is the energy dissipated in the jump? How can jumps be used in engineering practice?**

3. **Calculate the critical depth, and compare them with the conjugate depths observed in the jump.**
Transcribed Image Text:**Questions for Discussion:** 1. **Summarize the energy loss across the jump that you created expressed as a percentage of the upstream energy. Do you consider this significant?** 2. **How is the energy dissipated in the jump? How can jumps be used in engineering practice?** 3. **Calculate the critical depth, and compare them with the conjugate depths observed in the jump.**
**Part 3 – Hydraulic Jump and Critical Depth – C4 Flume**

- **Channel width**: 7.6 cm
- **Flume Slope**: 3%
- **Distance between gauges**: 100 cm

---

**Jump Condition Table:**

| Jump Condition | y₁ (cm) | y₂ (cm) | z₁ (cm) | z₂ (cm) | Q (cm³/sec) | V₁ (cm/sec) | V₂ (cm/sec) | Computed Hⱼ (cm) | % loss based on Upstream Energy |
|----------------|---------|---------|---------|---------|-------------|--------------|--------------|------------------|---------------------------------|
| Direct         | 1.59    | 11      | 3       | 0       | 1570        | 129.924      | 18.78        | 9.41             | 15.26                           |

---

**Computed y_c**: 3.5 cm

---

**Calculations:**

1. **V₁ = Q / y₁:**

   - \( V₁ = \frac{1570}{7.6 \times 1.59} \)
   - \( V₁ = 129.924 \, \text{cm/sec} \)

2. **V₂ = Q / y₂:**

   - \( V₂ = \frac{1570}{7.6 \times 11} \)
   - \( V₂ = 18.78 \, \text{cm/sec} \)

3. **Hydraulic Jump (HJ):**

   - \( HJ = y₂ - y₁ \)
   - \( HJ = 11 - 1.59 \)
   - \( HJ = 9.41 \, \text{cm} \)

4. **% Energy Loss:**

   - \( E_{\text{ups}} = y₁ + z₁ + \frac{V₁^2}{2g} \)
   - \( E_{\text{ups}} = 1.59 + 3 + \frac{129.924^2}{2 \times 981} \)
   - \( E_{\text{ups}} \approx 13.1986 \, \text{cm} \)

   - \( E_{\text{dls
Transcribed Image Text:**Part 3 – Hydraulic Jump and Critical Depth – C4 Flume** - **Channel width**: 7.6 cm - **Flume Slope**: 3% - **Distance between gauges**: 100 cm --- **Jump Condition Table:** | Jump Condition | y₁ (cm) | y₂ (cm) | z₁ (cm) | z₂ (cm) | Q (cm³/sec) | V₁ (cm/sec) | V₂ (cm/sec) | Computed Hⱼ (cm) | % loss based on Upstream Energy | |----------------|---------|---------|---------|---------|-------------|--------------|--------------|------------------|---------------------------------| | Direct | 1.59 | 11 | 3 | 0 | 1570 | 129.924 | 18.78 | 9.41 | 15.26 | --- **Computed y_c**: 3.5 cm --- **Calculations:** 1. **V₁ = Q / y₁:** - \( V₁ = \frac{1570}{7.6 \times 1.59} \) - \( V₁ = 129.924 \, \text{cm/sec} \) 2. **V₂ = Q / y₂:** - \( V₂ = \frac{1570}{7.6 \times 11} \) - \( V₂ = 18.78 \, \text{cm/sec} \) 3. **Hydraulic Jump (HJ):** - \( HJ = y₂ - y₁ \) - \( HJ = 11 - 1.59 \) - \( HJ = 9.41 \, \text{cm} \) 4. **% Energy Loss:** - \( E_{\text{ups}} = y₁ + z₁ + \frac{V₁^2}{2g} \) - \( E_{\text{ups}} = 1.59 + 3 + \frac{129.924^2}{2 \times 981} \) - \( E_{\text{ups}} \approx 13.1986 \, \text{cm} \) - \( E_{\text{dls
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